package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aopalliance.intercept.Joinpoint;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面，实现公共字段填充
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){

    }

    //前置通知，在通知中进行公共字段的填充
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinpoint){
        log.info("开始进行公共字段自动填充。。");

        //获取到当前被 拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinpoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获得方法上的注解对象
        OperationType operationType = autoFill.value(); //获取数据库操作类型，mapper里的OperationType.UPDATE

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinpoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];



        //准备赋值的数据
        Long currentId = BaseContext.getCurrentId();
        LocalDateTime now = LocalDateTime.now();



        //根据数据库操作类型，给实体对象的对应属性通过反射进行赋值
        if (operationType == OperationType.INSERT) {
            //为4个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            }catch (Exception e) {
                e.printStackTrace();
            }

        }else if (operationType == OperationType.UPDATE) {

            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            }catch (Exception e) {
                e.printStackTrace();
            }

            //为2个公共字段赋值
        }


    }
}
